// GET api/TweetBlog
        public async Task<List<RssItem>> Get()
        {
            var rssReader = new HateBloRssReader(new Uri("http://blog.nakajix.jp/rss"));

            // 過去36時間内に投稿したものを対象にする
            var items = await rssReader.GetRssItemsAsync(
                                    DateTime.Now.AddHours(-36),
                                    DateTime.Now
                                    );

            var twitterHelper = new TwitterHelper();
            try
            {
                if (items.RssItems.Count == 0)
                {
                    var message = string.Format(MessageNoBlog, (DateTime.Now - items.LastPubDate.Value).Days);
                    await twitterHelper.UpdateStatusAsync(message);
                    return null;
                }

                foreach (var rssItem in items.RssItems)
                {
                    var message = string.Format(MessageTemplate, rssItem.Title, rssItem.Link);
                    await twitterHelper.UpdateStatusAsync(message);
                }
                return items.RssItems;
            }
            catch (Exception ex)
            {
                return null;
            }
        }
        public void 指定期間内のエントリを取得()
        {
            var xml = File.ReadAllText(@".\TestData\rss.xml");
            _sut = new HateBloRssReader(xml);

            var items = _sut.GetRssItemsAsync(new DateTime(2014, 8, 16, 9, 0, 0), new DateTime(2014, 8, 16, 10, 0, 0)).Result as RssInfo;

            Assert.AreEqual(1, items.RssItems.Count());
        }